This site seems more suitable to older grades as it is quite time consuming and difficult to navigate.
Once the school has been registered, it is quite easy to save projects and load them up later to continue working (no privacy concerns)
Although it could be a useful presentation tool, all items that you wish to include would need to be uploaded separately since the gallery on this site is not easily searchable.
The tool can be used in many curricular areas, but if you do choose to use this tool be sure to check out the "Teachers" area of the site for valuable resources and ready made projects that are available for use.
Here is a link to a video introduction to the Museum Box tool:
http://museumbox.e2bn.org/about/